Although very few smartphone apps made in Japan have managed to take the world by storm, one that has is CocoPPa. Made by Japanese company United, Inc., the app allows users to customize the design of not only their smartphone wallpaper but also the icons for the other apps on their phone.
CocoPPa offers millions of designs to download, allowing users to set new wallpapers and replace icons for basic apps and common favorites such as Facebook and YouTube. Wallpaper and icons can be downloaded in sets, too, so that users can apply a unified theme to their home screen.
While in English such apps are categorized as customization or wallpaper apps, in Japanese they are called kisekae apps (which means "dress-up play"), as though the smartphone was a person and the user was changing its clothes.